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Loans and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance $ 24,460 $ 29,030 $ 32,353
Provision for loan losses (1,479) (3,064) (2,716)
Recoveries of loans previously charged-off 1,616 2,838 5,754
Loans charged off (2,850) (4,344) (6,361)
Ending balance 21,747 24,460 29,030
Commercial and Industrial      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 5,135 6,600 6,756
Provision for loan losses 212 (624) 748
Recoveries of loans previously charged-off 524 112 610
Loans charged off (562) (953) (1,514)
Ending balance 5,309 5,135 6,600
Construction      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 5,143 3,721 5,033
Provision for loan losses (417) 149 (1,559)
Recoveries of loans previously charged-off 216 1,354 539
Loans charged off (2) (81) (292)
Ending balance 4,940 5,143 3,721
Residential Real Estate | 1-to-4 Family Mortgage      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 4,176 6,364 7,211
Provision for loan losses (882) (1,521) 417
Recoveries of loans previously charged-off 127 161 222
Loans charged off (224) (828) (1,486)
Ending balance 3,197 4,176 6,364
Residential Real Estate | Residential Line of Credit      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 2,201 2,790 2,775
Provision for loan losses (630) (645) 311
Recoveries of loans previously charged-off 174 286 166
Loans charged off (132) (230) (462)
Ending balance 1,613 2,201 2,790
Residential Real Estate | Multi-Family Mortgage      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 311 184 342
Provision for loan losses 193 127 (3,223)
Recoveries of loans previously charged-off     3,065
Ending balance 504 311 184
Commercial Real Estate | Owner Occupied      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 3,682 6,075 5,659
Provision for loan losses (271) (1,366) 942
Recoveries of loans previously charged-off 140 35 162
Loans charged off (249) (1,062) (688)
Ending balance 3,302 3,682 6,075
Commercial Real Estate | Non-Owner Occupied      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 2,622 2,641 3,438
Provision for loan losses (271) (307) (357)
Recoveries of loans previously charged-off 195 342 568
Loans charged off (527) (54) (1,008)
Ending balance 2,019 2,622 2,641
Consumer and Other      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 1,190 655 1,139
Provision for loan losses 587 1,123 5
Recoveries of loans previously charged-off 240 548 422
Loans charged off (1,154) (1,136) (911)
Ending balance $ 863 $ 1,190 $ 655